![]() Second, the flow of gas is driven by pressure gradient with the only possible direction of flow being that from a higher to a lower pressure. First, pressure is a scalar quantity, not a vector quantity, and has no direction. The word back seems to suggest a pressure that is exerted on a fluid against its direction of flow-indeed, back pressure definitions of that sort are common in sources of relaxed scientific standards. ![]() It should be noted that the term “back pressure” is counter-intuitive and may interfere with a proper understanding of the exhaust gas flow mechanics. ![]() The term back pressure can be also spelled as one word (backpressure) or using a hyphen (back-pressure). For this discussion, the exhaust back pressure is the gage pressure in the exhaust system at the outlet of the exhaust turbine in turbocharged engines or the pressure at the outlet of the exhaust manifold in naturally aspirated engines. Effect on Emissions and Fuel ConsumptionĮngine exhaust back pressure is defined as the exhaust gas pressure that is produced by the engine to overcome the hydraulic resistance of the exhaust system in order to discharge the gases into the atmosphere.Increased back pressure levels can cause increased emissions, increased fuel consumption, and can negatively affect engine performance. Abstract: Exhaust system components such as mufflers and exhaust aftertreatment devices are a source of engine exhaust back pressure. ![]()
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